formlayouttab.java

SWT开发例子

						String controlString = item.getText (BOTTOM_COL);
						int index = new Integer (controlString.substring (controlString.indexOf (',') - 1, controlString.indexOf (','))).intValue ();
						code.append ("\t\tdata.bottom = new FormAttachment (" + names [index] + ", " + data.bottom.offset + ", SWT." + alignmentString (data.bottom.alignment) + ");\n");
					} else {
						code.append ("\t\tdata.bottom = new FormAttachment (" + data.bottom.numerator + ", " + data.bottom.offset + ");\n");
					}
				}
				code.append ("\t\t" + names [i] + ".setLayoutData (data);\n");
			}
		}
		return code;
	}
	
	/**
	 * Returns the layout data field names.
	 */
	String [] getLayoutDataFieldNames() {
		return new String [] {
			"",
			"Control", 
			"width", 
			"height", 
			"left", 
			"right", 
			"top", 
			"bottom"
		};
	}
	
	/**
	 * Gets the text for the tab folder item.
	 */
	String getTabText () {
		return "FormLayout";
	}
	
	/**
	 * Takes information from TableEditors and stores it.
	 */
	void resetEditors () {
		resetEditors (false);
	}
	
	void resetEditors (boolean tab) {
		TableItem oldItem = comboEditor.getItem ();
		if (oldItem != null) {
			int row = table.indexOf (oldItem);
			try {
				new Integer (widthText.getText ()).intValue ();
			} catch (NumberFormatException e) {
				widthText.setText (oldItem.getText (WIDTH_COL));
			}
			try {
				new Integer (heightText.getText ()).intValue ();
			} catch (NumberFormatException e) {
				heightText.setText (oldItem.getText (HEIGHT_COL));
			}
			String [] insert = new String [] {String.valueOf (row), combo.getText (), widthText.getText (), heightText.getText ()};
			data.setElementAt (insert, row);
			for (int i = 0 ; i < MODIFY_COLS; i++) {
				oldItem.setText (i, ((String [])data.elementAt (row)) [i]);
			}
			if (!tab) disposeEditors ();
		}
		setLayoutState ();
		refreshLayoutComposite ();
		setLayoutData ();
		layoutComposite.layout (true);
		layoutGroup.layout (true);
	}
	
	/**
	 * Sets an attachment to the edge of a widget using the
	 * information in the table.
	 */
	FormAttachment setAttachment (String attachment) {
		String control, align;
		int position, offset;
		int comma = attachment.indexOf (',');
		char first = attachment.charAt (0);
		if (Character.isLetter(first)) {
			/* Case where there is a control */
			control = attachment.substring (0, comma);
			int i = 0;
			while (i < control.length () && !Character.isDigit (control.charAt (i))) {
				i++;
			}
			String end = control.substring (i);
			int index = new Integer (end).intValue ();
			Control attachControl = children [index];
			int colon = attachment.indexOf (':');
			try {
				offset = new Integer (attachment.substring (comma + 1, colon)).intValue ();
			} catch (NumberFormatException e) {
				offset = 0;
			}
			align = attachment.substring (colon + 1);
			return new FormAttachment (attachControl, offset, alignmentConstant (align));
		} else {
			/* Case where there is a position */
			try {
				position = new Integer (attachment.substring (0,comma)).intValue ();	
			} catch (NumberFormatException e) {
				position = 0;
			}
			try {
				offset = new Integer (attachment.substring (comma + 1)).intValue ();
			} catch (NumberFormatException e) {
				offset = 0;
			}
			return new FormAttachment (position, offset);		
		}
	}
	
	/**
	 * Sets the layout data for the children of the layout.
	 */
	void setLayoutData () {
		Control [] children = layoutComposite.getChildren ();
		TableItem [] items = table.getItems ();
		FormData data;
		int width, height;
		String left, right, top, bottom;
		for (int i = 0; i < children.length; i++) {
			width = new Integer (items [i].getText (WIDTH_COL)).intValue ();
			height = new Integer (items [i].getText (HEIGHT_COL)).intValue ();
			data = new FormData ();
			if (width > 0) data.width = width;
			if (height > 0) data.height = height;
			
			left = items [i].getText (LEFT_COL);
			if (left.length () > 0) {
				data.left = setAttachment (left);
				if (data.left.control != null) {
					String attachment = checkAttachment (left, data.left);
					items [i].setText (LEFT_COL, attachment);
				}
			}
			right = items [i].getText (RIGHT_COL);
			if (right.length () > 0) {
				data.right = setAttachment (right);
				if (data.right.control != null) {
					String attachment = checkAttachment (right, data.right);
					items [i].setText (RIGHT_COL, attachment);
				}
			}
			top = items [i].getText (TOP_COL);
			if (top.length () > 0 ) {
				data.top = setAttachment (top);
				if (data.top.control != null) {
					String attachment = checkAttachment (top, data.top);
					items [i].setText (TOP_COL, attachment);
				}
			}
			bottom = items [i].getText (BOTTOM_COL);
			if (bottom.length () > 0) {
				data.bottom = setAttachment (bottom);
				if (data.bottom.control != null) {
					String attachment = checkAttachment (bottom, data.bottom);
					items [i].setText (BOTTOM_COL, attachment);
				}
			}
			children [i].setLayoutData (data);
		}
	}
	
	/**
	 * Sets the state of the layout.
	 */
	void setLayoutState () {
		/* Set the margins and spacing */
		try {
			formLayout.marginHeight = new Integer (marginHeight.getText ()).intValue ();
		} catch (NumberFormatException e) {
			formLayout.marginHeight = 0;
			marginHeight.select (0);
		}
		try {
			formLayout.marginWidth = new Integer (marginWidth.getText ()).intValue ();
		} catch (NumberFormatException e) {
			formLayout.marginWidth = 0;
			marginWidth.select (0);
		}
	}
	
	
	/**
	 * <code>AttachDialog</code> is the class that creates a
	 * dialog specific for this example. It creates a dialog
	 * with controls to set the values in a FormAttachment.
	 */
	public class AttachDialog extends Dialog {
		String result = "";
		String controlInput, positionInput, alignmentInput, offsetInput;
		int col = 0;
		
		public AttachDialog (Shell parent, int style) {
			super (parent, style);
		}
		
		public AttachDialog (Shell parent) {
			this (parent, 0);
		}
		
		public void setColumn (int col) {
			this.col = col;
		}
	 
		public String open () {
			Shell parent = getParent ();
			final Shell shell = new Shell (parent, SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);
			shell.setText (getText ());
			GridLayout layout = new GridLayout ();
			layout.numColumns = 3;
			layout.makeColumnsEqualWidth = true;
			shell.setLayout (layout);
			
			/* Find out what was previously set as an attachment */
			TableItem newItem = leftEditor.getItem ();
			result = newItem.getText (col);
			String oldAttach = result;
			String oldPos = "0", oldControl = "", oldAlign = "DEFAULT", oldOffset = "0";
			boolean isControl = false;
			if (oldAttach.length () != 0) {
				char first = oldAttach.charAt (0);
				if (Character.isLetter(first)) {
					/* We have a control */
					isControl = true;
					oldControl = oldAttach.substring (0, oldAttach.indexOf (','));
					oldAlign = oldAttach.substring (oldAttach.indexOf (':') + 1);
					oldOffset = oldAttach.substring (oldAttach.indexOf (',') + 1, oldAttach.indexOf (':'));
				} else {
					/* We have a position */
					oldPos = oldAttach.substring (0, oldAttach.indexOf (','));
					oldOffset = oldAttach.substring (oldAttach.indexOf (',') + 1);
					if (oldOffset.endsWith (")")) { // i.e. (Default)
						oldOffset = oldOffset.substring (0, oldOffset.indexOf (' '));
					}
				}
			}
			
			/* Add position field */
			final Button posButton = new Button (shell, SWT.RADIO);
			posButton.setText (LayoutExample.getResourceString ("Position"));
			posButton.setSelection (!isControl);			
			final Combo position = new Combo (shell, SWT.NONE);
			position.setItems (new String [] {"0","25","50","75","100"});
			position.setText (oldPos);
			position.setEnabled (!isControl);			
			GridData data = new GridData (GridData.FILL_HORIZONTAL);
			data.horizontalSpan = 2;
			position.setLayoutData (data);
			
			/* Add control field */
			final Button contButton = new Button (shell, SWT.RADIO);
			contButton.setText (LayoutExample.getResourceString ("Control"));
			contButton.setSelection (isControl);
			final Combo control = new Combo (shell, SWT.READ_ONLY);
			TableItem [] items = table.getItems ();
			TableItem currentItem = leftEditor.getItem ();
			for (int i = 0; i < table.getItemCount (); i++) {
				if (items [i].getText (0).length() > 0) {
					if (items [i] != currentItem) {
						control.add (items [i].getText (COMBO_COL) + i);
					}
				}
			}
			if (oldControl.length () != 0) control.setText (oldControl);
			else control.select (0);
			control.setEnabled (isControl);
			data = new GridData (GridData.FILL_HORIZONTAL);
			data.horizontalSpan = 2;
			control.setLayoutData (data);
			
			/* Add alignment field */
			new Label (shell, SWT.NONE).setText (LayoutExample.getResourceString ("Alignment"));
			final Combo alignment = new Combo (shell, SWT.NONE);
			String[] alignmentValues;
			if (col == LEFT_COL || col == RIGHT_COL) {
				alignmentValues = new String [] {"SWT.LEFT", "SWT.RIGHT", "SWT.CENTER", "SWT.DEFAULT"};
			} else {
				// col == TOP_COL || col == BOTTOM_COL
				alignmentValues = new String [] {"SWT.TOP", "SWT.BOTTOM", "SWT.CENTER", "SWT.DEFAULT"};
			}
			alignment.setItems (alignmentValues);
			alignment.setText ("SWT." + oldAlign);
			alignment.setEnabled (isControl);
			data = new GridData (GridData.FILL_HORIZONTAL);
			data.horizontalSpan = 2;
			alignment.setLayoutData (data);
			
			/* Add offset field */
			new Label (shell, SWT.NONE).setText (LayoutExample.getResourceString ("Offset"));
			final Text offset = new Text (shell, SWT.SINGLE | SWT.BORDER);
			offset.setText (oldOffset);
			data = new GridData (GridData.FILL_HORIZONTAL);
			data.horizontalSpan = 2;
			offset.setLayoutData (data);
			
			/* Add listeners for choosing between position and control */
			posButton.addSelectionListener (new SelectionAdapter () {
				public void widgetSelected (SelectionEvent e) {
					position.setEnabled (true);
					control.setEnabled (false);
					alignment.setEnabled(false);
				}
			});
			contButton.addSelectionListener (new SelectionAdapter () {
				public void widgetSelected (SelectionEvent e) {
					position.setEnabled (false);
					control.setEnabled (true);
					alignment.setEnabled(true);
				}
			});
			
			Button clear = new Button (shell, SWT.PUSH);
			clear.setText (LayoutExample.getResourceString ("Clear"));
			clear.setLayoutData (new GridData (GridData.HORIZONTAL_ALIGN_END));
			clear.addSelectionListener (new SelectionAdapter () {
				public void widgetSelected (SelectionEvent e) {
					result = "";
					shell.close ();
				}
			});
			/* OK button sets data into table */
			Button ok = new Button (shell, SWT.PUSH);
			ok.setText (LayoutExample.getResourceString ("OK"));
			ok.setLayoutData (new GridData (GridData.HORIZONTAL_ALIGN_CENTER));
			ok.addSelectionListener (new SelectionAdapter () {
				public void widgetSelected (SelectionEvent e) {
					controlInput = control.getText ();
					alignmentInput = alignment.getText ().substring (4);
					positionInput = position.getText ();
					if (positionInput.length () == 0) positionInput = "0";
					try {
						new Integer (positionInput).intValue ();
					} catch (NumberFormatException except) {
						positionInput = "0";
					}
					offsetInput = offset.getText ();
					if (offsetInput.length () == 0) offsetInput = "0";
					try {
						new Integer (offsetInput).intValue ();
					} catch (NumberFormatException except) {
						offsetInput = "0";
					}
					if (posButton.getSelection() || controlInput.length () == 0) {
						result = positionInput + "," + offsetInput;
					} else {
						result = controlInput + "," + offsetInput + ":" + alignmentInput;
					}
					shell.close ();
				}
			});
			Button cancel = new Button (shell, SWT.PUSH);
			cancel.setText (LayoutExample.getResourceString ("Cancel"));
			cancel.setLayoutData (new GridData (GridData.HORIZONTAL_ALIGN_BEGINNING));
			cancel.addSelectionListener (new SelectionAdapter () {
				public void widgetSelected (SelectionEvent e) {
					shell.close ();
				}
			});
			
			shell.setDefaultButton (ok);
			shell.pack ();
			/* Center the dialog */
			Point center = parent.getLocation ();
			center.x = center.x + (parent.getBounds ().width / 2) - (shell.getBounds ().width / 2);
			center.y = center.y + (parent.getBounds ().height / 2) - (shell.getBounds ().height / 2);
			shell.setLocation (center);
			shell.open ();
			Display display = shell.getDisplay ();
			while (!shell.isDisposed ()) {
				if (display.readAndDispatch ()) display.sleep ();
			}
			
			return result;
		}
	}
}